Structure Analyses of the Wings of Anotogaster Sieboldii and Hybris Subjacens

Abstract:

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The wings of a dragonfly have many complicated structures. The configuration of the
costal vein of the wings of a dragonfly is different from them of other insects. So, we paid attention
to the configuration of the costal vein of the wings in this study. In order to know the functions and
structures of the wings of a dragonfly, several 3-D models of the wing of Anotogaster Sieboldii
were created, and calculated with the 3-D finite element method. In addition, we created a 3-D
model of the wing of Hybris Subjacens which has the configuration of original wing, and compared
the models of Anotogaster Sieboldii and Hybris Subjacens. As a result, it was clarified that the arch
configuration of the costal vein controls the bending and the torsion of the wings.

Abstract: In generally, it is known that structures of living thing are optimized. The wings of a
dragonfly are thin and light. Although it is having the structure of bearing the load produced in the
case of an advanced flight such as “Flapping flight”, “Glide”, and “Hovering”. The wings of a
dragonfly are made by veins and membranes. In addition, the wings of a dragonfly have some
characteristic structures, such as “Nodus”. Thus, the wings of dragonfly have many complicated
structures. The configuration of costal vein of the wings is different from them of other insects. So,
we paid attention to the configuration of costal vein of the wings. Therefore, in this study, we
researched about the effect of costal vein. As a result, it was showed that the configuration of costal
vein became bending and torsional deformation small. In addition, it was showed that the
configuration of costal vein related to nodus. In this study, several 3-D models of the dragonfly’s
wing were made and calculated by the 3-D finite element method.

Abstract: With full-bridge longitudinal-connected foundation plates,CRTSⅡslab track sets type ∏ terminal restricted configuration anchorage structure in the bedroad-bridge transition section,in order to transmit forces such as temperature force and braking force from foundation plate to subgrade. In connection with the deficiency of exsiting researches, through the established finite element analysis model on Type ∏ terminal restricted configuration transition section,its mechanical characteristics under the most unfavorable longitudinal load by changing the structural parameters of transition section are analyzed, focusing on the criterion that the range of maximum of longitudinal displacement is 3mm.Analysis results show that when the longitudinal force is being transmitted to the anchorage structure, the maximum stress and longitudinal displacement of main terminal restricted configuration are far less than the limit and this process has little influence on track geometrical regularity .The laying of sliding layer can ameliorate structural force and deformation. However, changing its friction coefficient has no effect. Moreover, as the soil is under elastic deformation stage, its elastic modulus presents significant effects on mechanical properties of transmit section while its internal friction angle and cohesion have no influence.

Abstract: When crude oil contains wax and hydrate depositions, thermal management is needed to built up to prevent these deposition formation. Thermal insulation pipe is the common measure. Laying thermal insulation pipe is a complex operation due to their multi-layer structure and heavier weight. In this paper, mechanical analysis for thermal insulation pipe laid by S-lay is carried out. Large deformation theory is applied to establish S-lay model. Equivalent stiffness theory is used to solve the complicated structure. Numerical simulation is done to investigate the effect of controlling parameters to the pipe configuration. Numerical results show that the tension is the main controlling parameter during pipelay.